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4 years ago

14

Ian borrowed 1000 bucks from his parents and ken burrowed 600 bucks.Ian plans to pay them back at the rate of $60 per month.Ken

plans to pay his parents at a rate of $20 per month.How many months will the boys owe the same amount?

1 answer:

PSYCHO15rus [73]4 years ago

7 0

After x months Ian owes 1000 - 60x

After x months Ken owes 600 - 20x

They're equal when

1000 - 60x = 600 - 20x

400 = 40x

x = 10

Answer: 10 months

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$Total\ Selection = 30\ ways$

Step-by-step explanation:

Given

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Boys = 5

Required

How many ways can 2 boys and girls be chosen?

The keyword in the question is chosen;

This implies combination and will be calculated as thus;

$Selection =\ ^nC_r = \frac{n!}{(n-r)!r!}$

For Boys;

n = 5 and r = 2

$Selection =\ ^5C_2$

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$Selection = \frac{5 * 4 * 3!}{3!*2 * 1}$

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For Girls;

n = 3 and r = 2

$Selection =\ ^3C_2$

$Selection = \frac{3!}{(3-2)!2!}$

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